Hi. I am 16 years old. The first time I had sex was on June 7, 2014. My boyfriend and I used a condom (Durex Fetherlite) but since I was paranoid, I took Nordette ECP pills to make sure I wouldn't get pregnant. 4 pills at 12 am then 4 more pills after 12 hours. I experienced sore breasts and extreme nausea.

Then on June 11, 2014. We had sex again. Using the same Durex Fetherlite condom. After a few hours, we had sex again with a condom also.

My period is due today (June 11, 2014) but I haven't gotten it yet.
It has been less than 24 hours since the sex. Should I still take the 4 Nordette pills? Is it safe?